Gusya ibyuma, bizwi kandi nko gusya cyangwa gusya ibyuma, ni igiterane gifunguye cyateranirijwe ibyuma, aho utubari twa feri, dukorera mu cyerekezo kimwe, ushyizwe hamwe no gufatana runini ku tubari twambukiranya kuri perpendikulari cyangwa no guhuza utubari twagutse. hagati yabo, igenewe gufata imitwaro iremereye hamwe n'uburemere buke.Ikoreshwa cyane nk'amagorofa, mezzanine, gukandagira ingazi, kuzitira, gupfundika imyobo hamwe no gufata neza inganda mu nganda, mu mahugurwa, mu byumba bya moteri, imiyoboro ya trolley, ahantu hapakira ibintu byinshi, ibikoresho byo gutekesha hamwe n'ibikoresho biremereye, n'ibindi.
